Singer Demi Lovato, who was treated for bulimia in 2010, called the performance "sad" in a tweet to her fans.

"Bottom line, it's not 'cool' or 'artsy' at all," Lovato wrote.

"Would you let someone bring a needle and shoot up on you? Addiction is addiction," she continued.

Brown, however, insisted in an interview with Elle that her performance was in the name of art.

"It feels completely different from when you're ill," she told the magazine. "It feels quite good in a way, because it's like you're cleaning out your body. It's kind of a cleanse."

It feels irresponsible of Gaga, who admitted she once suffered from an eating disorder.

She has campaigned against bullying and has come out swinging when critics targeted their comments on her body.

This seems like the latest example of pop stars taking it too far.

Bottom line: Not only was Gaga and Brown's performance gross, it crosses the line by promoting self-harm. They took the stage at one of the hippest of all hipster events and proceeded to act like self-induced vomiting was cool. Not cool, Gaga.